Device and method for preparing bimetallic compounding roll by electric slag remelting method

Abstract

The invention relates to a device and a method for preparing a bimetallic compounding roll by an electric slag remelting method. The device comprises an upper crystallizer and a lower water-cooling crystallizer, wherein the upper crystallizer and the lower water-cooling crystallizer form a T-shaped crystallizer; the upper crystallizer is a conductive crystallizer, and is insulated and isolated from the lower water-cooling crystallizer, and the lower water-cooling crystallizer is provided with a liquid level detector; a remelting compounding transformer is connected with the upper crystallizerthrough a short electrified wire. The method comprises the following steps of after slagging is finished, disengaging a slagging power supply loop; during slag firing, when the liquid level of a slagtank in the crystallizer submerges the lower edge of a conductive graphite block, conducting a roll core preheating power supply loop, and preheating a roll core; after preheating is finished, closingthe loop, lowering a self-consumption electrode to the end part, inserting into the slag tank, conducting an electrode melting and bimetallic compounding power supply loop, and finally performing thebimetallic melting compounding. The device and the method have the advantages that by adopting a method for improving the electric slag testing device and the power supply loop, the temperature fieldat the surface of the roll core is reasonably optimized, so as to prepare the bimetallic compounding roll with better interface bonding quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a device and method for preparing bimetallic composite rolls by electroslag remelting. Background technique [0002] In recent years, with the advent of advanced rolling mills and high-efficiency rolling technology, the roll production line is developing towards large-scale, high-speed and automatic, which makes the working conditions of the roll, the main consumable equipment in steel rolling production, more severe. The performance of the roll directly affects the production efficiency of the rolling mill, the surface quality of the rolled material and the rolling cost. Therefore, the research on the material and production process of the roll has become a common concern of the roll and metallurgical industries at home and abroad. [0003] As we all know, the traditional single-material alloy roll is difficult to meet the dual requirements of wear resistance and ...

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Problems solved by technology

[0007] In order to overcome the shortcomings of the power supply circuit scheme in the process of preparing composite rolls by the traditional electroslag remelting method and the lack of effective preheating of the roll core in the early stage of the test, resulting in insufficient bonding defects at the bimetallic interface, the present invention provides an electroslag remelting method. The device and method of the bimetallic composite roll change the position of the high temperature zone of the slag pool by adjusting the flow path of the current in the composite roll smelting system, and at the same time liberate the roll core from the power supply circuit so as to prevent it from becoming a part of the power supply circuit Extremely, avoiding excessive melting of the roll core surface, which not only improves the uniformity of the bimetal bonding interface but also effectively improves its bonding quality

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